Re: [dnsext] Spec for AA in query meaning AA-only?

"George Barwood" <george.barwood@blueyonder.co.uk> Tue, 08 February 2011 08:28 UTC

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From: "George Barwood" <george.barwood@blueyonder.co.uk>
To: "Phil Pennock" <namedroppers+phil@spodhuis.org>, <dnsext@ietf.org>
References: <20110208063759.GA35601@redoubt.spodhuis.org>
Date: Tue, 8 Feb 2011 08:28:20 -0000
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Subject: Re: [dnsext] Spec for AA in query meaning AA-only?
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----- Original Message ----- 
From: "Phil Pennock" <namedroppers+phil@spodhuis.org>
To: <dnsext@ietf.org>
Sent: Tuesday, February 08, 2011 6:37 AM
Subject: [dnsext] Spec for AA in query meaning AA-only?


> RFC 1035 defines AA for responses; I'm failing to find a specification
> which states that AA in a query means AA-only.

The meaning of the AA flag bit in a query is not defined by the standard.
General principles dictate that senders should leave the bit zero, receivers should ignore it.

> I see +aaonly for dig.  Not finding a reference.

This is apparently an historic relic. I presume that at some point in the distant past some
servers must have assigned a meaning to AA being set in a query.
 
> Am I missing it or is this only an informal convention?

I don't think you have missed anything.

Regards,
George
 
> Thanks,
> -Phil
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